public class ThreadDemo2 {
    public static void main(String[] args) throws InterruptedException {
        Object locker = new Object();
        Thread t1 = new Thread(()->{
           try {
               System.out.println("wait 开始");
               synchronized (locker){
                   locker.wait();
               }
               System.out.println("wait 结束");
           }catch (InterruptedException e){
               e.printStackTrace();
           }
        });
        t1.start();
        Thread.sleep(1000);
        Thread t2 = new Thread(()->{
            synchronized(locker){
                System.out.println("notify 开始");
                locker.notify();
                System.out.println("notify 结束");
            }
        });
        t2.start();
    }
}
